Day 24: Augustus De Morgan

Our unit on logic in seventh grade is drawing to a close. Our final logic venture has been exploring truth tables. Here’s a recent example. The lower truth tables on that sheet demonstrate that not(p or q) is equivalent to (not p) and (not q). This is one of De Morgan’s laws. For homework Thursday night, my students did some research on the mathematician who formalized these laws, Augustus De Morgan. Today’s photo is of the posters that one of my classes made out of their compiled research.

In other seventh grade logic news, the Venn diagram video that my other class made is all edited and complete! (previously) I can’t put it up publicly on the web, since it shows students’ faces. However, if you’re interested in checking it out, fill out this form and I’ll share it with you.

I’ll leave you with the De Morgan quote that’s now up on my quote whiteboard: “The moving power of mathematical invention is not reasoning but imagination.”


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